Roll-tightening machine.



5. DUVALL.

ROLL TIGHTENING MACHINE.

APPLlcATloN FILED APR.23,1915.

Patented ne.14,1915.

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J. DUVALL.

ROLL TIGHTENING MACHINE. APPLICATION FILED APR.23.1915.

191495@ Patented Dec. 14, 1915.

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WITNESSES:

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.i ria c JAMES DUVALL, OF CAMAS, WASHINGTON.

ROLL-TIGHTENING MACHINE.

Specification of Letters Patent.

Patented Dec. la, lgll.

Application filed Apr123, 1915. Serial No. 23,529.

To all whom it may concern:

Be it known that l, JAMES DUVALL, a citi- Zen of the United States, anda resident of Camas, Clarke county, llVashington, have invented a newand useful Improvement in Roll-Tightening Machines, of which thefollowing is a specification.

My invention relates to devices to be used for tightening rolls of paperor other material, and it is particularly designed for winding up toiletpaper into compact rolls of uniform size. n l

As well known, the strip of toilet paper is fastened at its initial endto a hollow paper core, and since the material has low tenn silestrength, the roll must necessarily be wound rather loose, in order toprevent the breaking of the strip. But the rolls so ob` tained are tooloose for practical purposes,

and so it is found desirable that they be re wound into a more compactform, in order to facilitate handling and packing.

To this end, one of the main objects of my invention is to provide -amachine which will automatically rewind the roll from within,v and thedevice which l have provided for this purpose comprises the combinationof a rotatable shaft, adapted to receive a hollow-core roll, means forintermittently rotating the shaft, means for exerting a hold on theinterior of the hollow core of the roll placed on the shaft, to therebypre vent the rotation of the core about the shaft, but neverthelesspermitting it longitudinal movement on the latter, as required forplacing the roll on the shaft, and removing it therefrom; and means forexerting a frictional hold on the exterior of the roll mounted on theshaft, while such roll is in its normal state, but releasing such holdwhen the roll is rewound in such compact form as to reduce the same to apredetermined diameter.

The details of the mechanical means which are so combined in my machine,and the operation of the latter, are fully illustrated in theaccompanying drawings, in which,

Figure 1 'is a side elevation of -my machine; the spring friction armwhich holds the roll against rotation being shown in section; Fig. 2 is'a vertical -sectional elevation bf the parte 'shown --n l.; Fig- `E isaplan view of the top of my machine; Fig: t is a larger sized fragmentalvertical section of the mandrel on which the roll is mounted. The coreof the roll is shown 1n section so as to illustrate the manner in whichthe mandrel grips said core, so as to prevent rotation of the corerelative to' said mandrel; Fig. 5 is a horizontal section taken on'theline 5-5 of Fig Ll; the core being shown in broken outline; Fig. 6 is alarger sized horizontal section showing the details of the friction gearoperating mechanism; Fig. 7 is a vertical section taken approximately onthe line 7%-7 of Figs. 2 and G; and Fig. 8 is a detail view of thesleeve provided with a cam slot, by means of which the friction gear isthrown into operative state.

ln the drawings, a, a represent the side frame members of my machine; Z)is a topplate provided with a vertically projecting hub c, and d is abracket provided with-the bearing arms e, f, and g, said bracket CZbeing bolted to the frame member a. See Fig. 2. Bolted to the framemember a is a. bracket 71 provided with a bearing-hub z', the latterbeing in axial alinement with the bearing arm g, of the bracket (Z. A.radial stud-pin y', projects internally in the hub i. See Figs. 2, 6, 7and 8. A sleeve 7c, made with an integral lever arm Z, is provided witha helical, peripheral cam slot m, through which the stud-pin y',projects. Said sleeve is rotatably journaled in the hub z', and therotation of said sleeve le, will cause the latter to move longitudinallyto the position shown in the broken lines of Fig. 8. rlhis movement isdue to the cam action produced by the slot m, working on the fixedstud-pin j. A foot-lever n, piv otally mounted on the stud o, in theframe a, is connected to the lever arm Z, by a link p. A spring (7,normally holds the parts in the position shown in the full lines ofFigs. l

and 8. A constantly driven shaft r is roy tatably mounted in the bearingVarm g, and the sleeve la, said shaft being reciprocable in the bearingg. On the outer end of the shaft r, adjacent the sleeve lo, issetscrewed a coll-ar s, and pinned on the shaft adjacent the other endof .the sleeve 7c, and located between the two frame members a, a', is afriction :gear By lreason ef `this I'eonstruc tion, a depression of thefoot-pedal n, will cause the shaft 1^, and thereby the frictiongear t,to be displaced longitudinally along the axial line of said shaft r.rI`he shaft r is continuously driven by means which are not shown inthese drawings. The bearing arms e and f of the bracket Z are invertical alinement with the hub c, and rotatably journaled therein is avertical shaft u. A friction pinion 'zi is adjustably fixed on saidshaft u, by means of a set-screw w, and the slot This adjustment allowsthe speed of rotation of the shaft u to be regulated. The upper end ofthe shaft u is provided with a collar 2/, seated in a recess a, of thetop plate b, which collar prevents the shaft ,i/ from verticaldisplacement downwardly. The collar 2ixed on the shaft and bearingagainst the lower face of the hub c, prevents the shaft u from verticaldisplacement upwardly. The mandrel 4, located above the top plate b, isan integral part of the shaft u. vSaid mandrel is provided with arounded top 8, to facilitate the placing of the rolls thereon. Saidmandrel 4 is further provided with a diametric slot 9, in which aremounted gripper wheels 10, the peripheries of which are serrated so asto form the teeth 11. Said wheels 10, are rotatably mounted onY thebearing pins 12, which are fixed in the mandrel and the ends of whichare rounded off so as to conform with the cylindrical surface of saidmandrel. It is to be noted that the circular grippers 10 permit the core18 to move longitudinally of the mandrel, but prevent rotary movementrelative thereto.

On the top o, of the frame, are the vertical studs 13, on which is'fixeda spring cylindrical arm 14. See Fig. 3. A series of holes 15 areprovided in the face of the top Z9, and are adapted to hold a stop pin16, against which the spring arm 14 contacts, when the roll has beenreduced to a predetermined size.

17 represents a roll of toilet-paper and 18 is a paste-board core uponwhich said roll is wound.

The operation of my machine is as follows: IVhen the machine is in itsinactive state, the coil spring (j will hold all parts in the positionshown in Figs. 1 and 2. It will thus be seen by having reference to Fig.2 that the friction drive gear t will be out of engagement with thefriction pinion lv, and

` the lnandrel 4 will thereupon be stationary.

The roll of toilet paper 17, is then placed upon the mandrel 4, beingthen thrust down over the circular gripper wheels 10, and the teeth ofthe latter will bite into the body of the core and hold it againstrotation relative to said mandrel. The spring arm 14 is then placedaround the roll 17'and the stop pin 16 adjusted toone of the holes l5,de-

pending on the size to which the roll is to be reduced. rI`he foot-pedaln, is then depressed so as to throw the friction drive gear t intoengagement with the pinion o, thereby driving the mandrel in a rotarydirection. The tension of the spring arm 14 will exert a frictionalresistance which will hold the outside of said roll stationary and therotating mandrel will wind the core 18 within the roll, therebytightening the paper and reducing the roll to a smaller diameter. IVhenthe reduction of the roll to the proper diameter has been reached, thespring arm 14 will contact with the stop pin 1G, the frictionalresistance of said arm to the roll will be destroyed, and the roll willbe held against further tightening. After the tightening process hasbeen completed, the foot-pedal n, is allowed to resume its normalposition, whereupon the machine will be replaced to its inactive state.The roll may be readily removed from the mandrel.

I claim:

1. In a device of the character described, the combination of arotatable shaft adapted for receiving a hollow-core roll, such shaftformed with a recess, a vertical circular gripper-element journaled insuch recess projecting beyond the periphery of the shaft, and beingrotatable in a longitudinal plane of the latter, means for exerting africtional hold on the exterior of the roll mounted on the shaft, andother means adapted to release such hold when the roll is reduced belowa predetermined diameter.

2. In a device of the character described, the combination of arotatable shaft adapted for receiving a hollow-core roll, such shaftformed with a recess, a vertical circular gripper-element journaled insuch recess projecting beyond the periphery of the shaft, and beingrotatable in a longitudinal plane of the latter, means for exerting africtional hold on the exterior of the roll mounted on the shaft, andother adiustable means adapted to release such hold when the roll isreduced below a predetermined diameter.

3. In a device of the character described, the combination of arotatable shaft adapted for receiving a hollow-core roll, such shaftformed with a recess, a vertical circular gripper-element journaled insuch recess projecting beyond the periphery of the shaft, and beingrotatable in the longitudinal plane of the latter, a resilient armfastened at one end adjacent to the shaft. such arm adapted to encirclethe roll mounted on the shaft, and to contract its diameter normally.and means for limiting said contraction of the resilient arm.

4. In a device of the character described, the combination of arotatable shaft adapted for receiving a hollow-core roll, such shaftfarmed with a recess, a vertical circular to contract its diameternormally, and adgripper-element journaled in such recess projustablemeans for limiting said contraction jecting beyond the periphery of theshaft, of the resilient arm.

and being rotatable in a longitudinal plane JAMES DVALL. 5 of thelatter, a resilient arm fastened at one Witnesses:

end adjacent to the shaft, such arm adapted WVM. C. SCHMITT,

to encircle the roll mounted on the Shaft, and D. E. CRABB.

Copies of this patent may be obtained for ve cents each, by addressingthe Gommissioner of Patents. Washington, D. C.

